"Ideas are the source of all things."

"Self-conquest is the greatest of victories."

"All the gold which is under or upon the earth is not enough to give in exchange for virtue."

"I am not given to finding fault, for there are innumerable fools."

"There is nothing I like better than conversing with aged men. For I regard them as travelers who have gone a journey which I too may have to go, and of whom I ought to inquire whether the way is smooth and easy or rugged and difficult. Is life harder toward the end, or what report do you give it?"

"The matter is as it is in all other cases: If it is naturally in you to be a good orator, a notable orator you will be when you have acquired knowledge and practice.,."